Automated update to rustc stable-1.96.0

Author: Update Stable Rustc Bot

Cargo.toml

@@ -12,7 +12,7 @@ rust-version = "1.74.0"
 
 [workspace.metadata.rbmt.toolchains]
 nightly = "nightly-2026-05-14"
-stable = "1.95.0"
+stable = "1.96.0"
 
 [features]
 default = ["json-contract"]